Fulminiss

"Widely regarded as one of the greatest Sith sorcerers in the Empire, the enigmatic Lord Fulminiss is a master of the dark side’s most arcane and lethal aspects. The grotesque Harrower assassins are his most famous creation, but legend has it he once summoned a raging storm of pure Force energy that disintegrated a rebellious city of natives in the Imperial-conquered Jabiim system. Lord Fulminiss is a respected expert on the topic of mass extermination, and at the Emperor’s request, he has performed extensive research into new ways of eliminating planetary populations. More than one Dark Council member has paid handsomely to obtain a record of Lord Fulminiss’s work for his or her private perusal."